Arithmetic instuctional apparatus



FIG. 1 is a plan view of an arithmetic instructional device showing my new design;

FIG. 2 is a side view of the arithmetic instructional device of FIG. 1; and,

FIG. 3 is a bottom view of the arithmetic instructional device of FIG. 1.

The FIG. 1 view has been shaded to indicate color. 

The ornamental design for an arithmetic instructional apparatus, as shown and described. 